Shenzhen Water Affairs Group Co.

Shenzhen, China

Shenzhen Water Affairs Group Co.

Shenzhen, China
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Cai G.-Q.,Shenzhen Water Affairs Group Co. | Fu X.-M.,Harbin Institute of Technology | Liu L.-J.,Shenzhen Water Affairs Group Co. | Lu X.-Y.,Shenzhen Water Affairs Group Co. | And 4 more authors.
Huanjing Kexue/Environmental Science | Year: 2016

The influences of different chemical pre-oxidants, including sodium hypochlorite (NaClO), chlorine dioxide (ClO2), permanganate (KMnO4), hydrogen peroxide (H2O2), ozone (O3) and ozone/hydrogen peroxide (O3/H2O2), on chloral hydrate (CH) formation were studied for threonine that has the highest special chloral hydrate formation potential (SCHFP). Suitable pre-oxidants and corresponding optimal doses were determined to provide guidance for controlling chloral hydrate (CH) formation during drinking water treatment. The results indicated that the pre-oxidants that could decrease CH formation for one day incubation time (CH1d) were H2O2, ClO2, KMnO4 and NaClO, and the corresponding suitable doses were 3, 0.5, 0.6 and 0.5 mg·L-1, and the corresponding CH1d removal rates were 61.54%, 47.63%, 29.77% and 10.94%, respectively. The pre-oxidants that could decrease CH formation potential (CHFP) were KMnO4, NaClO, H2O2 and ClO2, and the corresponding suitable doses were 0.6 mg·L-1, 0.5 mg·L-1, 3 mg·L-1 and 0.5 mg·L-1, and the corresponding CHFP removal rates were 41.01%, 33.38%, 8.36% and 2.40%, respectively. In addition, O3 and O3/H2O2 were not suitable for controlling CH in the conventional treatment process because they could increase CH1d and CHFP. © 2016, Science Press. All right reserved.


Fu X.,Harbin Institute of Technology | Liu L.,Shenzhen Water Affairs Group Co. | Cai G.,Shenzhen Water Affairs Group Co. | Lu X.,Shenzhen Water Affairs Group Co. | And 3 more authors.
Chinese Journal of Environmental Engineering | Year: 2016

The removal of chloral hydrate (CH) and its precursors by powdered activated carbon (PAC), diatomite, and bentonite from a drinking water source in southern China was monitored. The daily CH yield (CH1d) and the CH formation potential (CHFP) indicated that bentonite and PAC were suitable for the removal of CH, with maximum removal rates of 95.93% and 86.86%, respectively. After the first 15 min, maximum adsorption rates of CH on bentonite and PAC were achieved at a dosage of 225 mg·L-1, with corresponding removal rates of 63.36% and 51.84%, respectively. Furthermore, the CH adsorption was saturated after 2 h, with corresponding removal rates of 89.36% and 61.75%, respectively. In addition, PAC and diatomite were suitable for the removal of CH precursors, both having optimal doses of 30 mg·L-1. PAC and diatomite exhibited removal rates of 57.49% and 75.21% for the CH1d, respectively, and 28.27% and 50.19% for the CHFP, respectively. The employment of PAC or diatomite to remove CH precursors depends on the level of risk associated with CH. © 2016, Science Press. All right reserved.


Liu W.,Harbin Institute of Technology | Cai G.-Q.,Shenzhen Water Affairs Group Co. | Lu X.-Y.,Shenzhen Water Affairs Group Co. | Liu L.-J.,Shenzhen Water Affairs Group Co. | And 4 more authors.
Huanjing Kexue/Environmental Science | Year: 2016

Amino acids are the main components of nitrogenous organic matter in surface water. In order to reveal the concentration variation and removal of amino acids in reservoirs water, the concentration variation of the twenty common amino acids for three main reservoirs' water in a typical southern city of China was monitored between May and October in the year of 2015 by HPLC, and the space distribution and change trend of the twenty amino acids were analyzed. In addition, the removal of the twenty amino acids was also studied by different water treatment processes. The results showed that the amino acids contents and composition were different among the three reservoirs. Aspartic acid, cysteine and leucine were the main amino acids for the three reservoirs. Besides, there was no obvious seasonal variation of amino acids content for reservoir C. However, the concentration of amino acids in autumn was higher than that in summer. Coagulation and sedimentation were main units for the removal of amino acids in conventional and BAC-UF processes while O3 oxidation was the main unit in O3-BAC process. 94.42%, 66.04% and 49.75% of total amino acids contents were removed by the conventional, BAC-UF and O3-BAC processes, respectively. © 2016, Science Press. All right reserved.


Cai G.,Harbin Institute of Technology | Cai G.,Shenzhen Water Affairs Group Co. | Liu L.,Shenzhen Water Affairs Group Co. | Lu X.,Shenzhen Water Affairs Group Co. | And 4 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

We analyzed the chloral hydrate (CH) formation under different reaction conditions, the relationship between CH and conventional disinfection by-products (DBPs) and the relationship between water quality indicators and CH formation potential (CHFP) for drinking water sources of a city in the south of China. The results indicated that CH yields increased with the increase of temperature from 5℃ to 35℃. CH degradation rate was greater than its formation rate when the temperature was 45℃ after about 30 h of chlorination reaction, and CH yields began to decrease correspondingly. CH yields decreased with the increase of pH, and it decreased to zero when pH was 11. As Cl2:TOC (mass ratio) was from 1:1 to 4:1, CH yields increased with the increase of chlorine dose. However, CH yields did not increse as Cl2:TOC was greater than 4:1. The positive correlation was detected between CH and conventional DBPs, i.e., THMs and HAAs. Furthermore, the relationship between CH and HAAs was more outstanding than that between CH and THMs. The linear relationship between CH formation potential (CHFP) and TOC of raw water was more outstanding compared with UV254 and SUVA254, hence, CHFP could be predicted by TOC approximately. © 2015, Science Press. All right reserved.


Cai G.,Shenzhen Water Affairs Group Co. | Liu L.,Shenzhen Water Affairs Group Co. | Lu X.,Shenzhen Water Affairs Group Co. | Zhang J.,Shenzhen Water Affairs Group Co. | And 3 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

Fluorescence characteristics variation and removal of dissolved organic matter (DOM) in a typical drinking water source in the south of China were researched in April to September, 2014. Simultaneously, the relationship between fluorescent fraction of DOM and chloral hydrate formation potential (CHFP) was analyzed. The results indicated that aromatic protein-like substances were main components of DOM, and the contents of soluble microbial product (SMP)-like substances, fulvic acid-like substances and humic acid-like substances increased in DOM gradually. The mean proportions of integral volumes of five fluorescence regions (ΦI,n, ΦII,n, ΦIII,n, ΦIV,n and ΦV, n) to total volume (ΦT,n) were 13.55%, 27.53%, 25.00%, 16.02% and 17.91%, respectively. CHFP of raw water DOM were from 27.06 μg/L to 81.20 μg/L, and the mean was 46.60 μg/L. Furthermore, the relationship between the content of CH precursors and SMP- like substances was the best. Compared with conventional treatment process, O3/BAC advanced treatment process substantially enhanced the removal rate of SMP-like substances, which is more helpful to control CH formation. © 2015, Science Press. All right reserved.

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